Paul Andersen starts with a brief description of enzymes and substrates. He then explains how you can measure the rate of an enzyme mediated reaction. Catalase from yeast is used to break hydrogen peroxide down into water and oxygen. ...

Ever since humans found out about germs, we’ve gone a bit overboard inventing antibacterial soap and antibiotics and antifungals. But despite our aversion to them, microbes aren’t all bad, and some of them could even help us...

Hank demonstrates how to build a hybrid rocket engine in your kitchen!

Hydrogen Peroxide: It fizzes, it stings, but does it actually do you any good? Find out on this week's Quick Question!

Paul Andersen explains how catalysts can speed up a reaction without being consumed in the reaction. Catalysts can lower the activation energy of reaction be stabilizing the transition state. They can also create new reaction pathways...

Paul Andersen explains how enzymes are used to break down substrates. The correct shape of the active site allows a key/lock fit between the enzyme and the substrate. The enzyme catalase is used to break down hydrogen peroxide. The...

Reagents- 3% Hydrogen peroxide Principle- This test demonstrate the presence of catalase, an enzyme that catalyses the release of oxygen from hydrogen peroxide (H2O2). It is used to differentiate those bacteria that produce an enzyme...

A substance that can protect against damage caused by free radicals.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig...

This video discusses collision theory and how it applies to chemical reactions. The concept of activation energy and how it relates to the rate of a chemical reaction is explained. The video goes on to explore three ways that the rate of...

Microbiology: Catalase Test

Catalase Physiology, Biochemistry, and Inorganic Mechanism

Protoporphyrinogen Oxidase: Physiology, Biochemistry, and Organic Mechanism

Kinetics Parameters for Catalase Part 2: kcat and efficiency

Kinetics Parameters for Catalase Part 1: Vmax and Km

In this video, I explain the biosynthetic pathway for the major Reactive Oxidative Species (ROS) such as hydrogen peroxide, hydroxyl radicals, and superoxide.

Peroxisomes and Lysosomes: Intracellular Defense

The royal archery contest begins! Everyone expects Robin Hood to win, since he is an accurate and reliable archer. But what do the terms accuracy and reliability mean? This lesson will explore accuracy and systematic errors, including...

The royal archery contest begins! Everyone expects Robin Hood to win, since he is an accurate and reliable archer. But what do the terms accuracy and reliability mean? This lesson will explore accuracy and systematic errors, including...